Performance check
The server answers quickly
Time to first byte, measured from the audit location.
medium severityperf.ttfb
Run this check on your site
Runs just this check in quick mode. The report opens with the evidence and the fix.
Why it matters
Every request starts with this delay. A slow server makes every other performance number worse and is visible to the visitor before anything is drawn.
How to fix it
Cache the response at the edge, keep the origin close to the visitor, and make sure the server does not do slow work before it answers.
The details
- Category
- Performance
- Severity of a failure
- medium
- Confidence
- medium
- Needs a browser
- No
- Check id
- perf.ttfb